zero.c

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#include <core/system.h>
#include <dev/dev.h>
#include <fs/posix.h>
#include <aquila/errno.h>
 
#include <memdev.h>
 
struct dev zerodev;

static ssize_t zerodev_read(struct devid *dd __unused, off_t offset __unused, struct iobuf *io)
{
    return iobuf_zero(io, io->resid);
}

static ssize_t zerodev_write(struct devid *dd __unused, off_t offset __unused, struct iobuf *io)
{
    return iobuf_skip(io, io->resid);
}
 
struct dev zerodev = {
    .read  = zerodev_read,
    .write = zerodev_write,
 
    .fops  = {
        .open  = posix_file_open,
        .read  = posix_file_read,
        .write = posix_file_write,
        .close = posix_file_close,
 
        .can_read  = __vfs_can_always,
        .can_write = __vfs_can_always,
        .eof       = __vfs_eof_never,
    },
};